Ps4 controller, new battery = controller like new?

In theory, can you always buy a battery for the controller for 9 euro, which then always works like new? Maybe some find the question stupid, but if it were that easy, I wonder why so many people just buy a new controller when the battery life of their controller is low

Why so many just buy a new controller

Because they are too stupid to change the battery, or they don't even know that it is possible, or think that it is too difficult.

If the problem is with the battery then this is an easy one to fix. With a little dexterity, the controller can be unscrewed, the battery unplugged, reconnected and screwed back on. But many do not dare to do this and therefore spend a lot of money on a new one.